I saw the same thing on all of my Macs (from OS 10.13.6 to 10.15.7). Editing text in the encrypted fields is critical for me since I store lots of important data that way. I reverted back to v7.1.4 for now. Hope they get a fix soon. I also can't edit in the "updated" iOS and web versions. Have to decrypt permanently then edit then re-encrypt... not a useable workflow!